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RISS 인기검색어
- 검색키워드
- 저자 : Shohreh Sohaei (검색결과 2 건)
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Shohreh Sohaei,Mehrzad Tahamouli Roudsari,Parham Memarzadeh 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.6
Circular columns are increasingly being used in today’s construction industry. Proper construction beam-circular column connections are an important problem in steel moment resisting frames with this type of connection. TahamouliRoudsari et al. introduced a new I-shaped beam-circular concrete-fi lled column connection in 2020. This connection makes use of a strengthened U-shaped profi le as an external stiff ener with simple detailing. Experimental tests showed that the connection satisfi es code-specifi ed criteria for rigid connections. The main objective of the present work is to present design guidelines and a more accurate numerical investigation of the detailing introduced by TahamouliRoudsari et al. For this, in the fi rst step, a numerical model of the experimental specimen was constructed and verifi ed in the ABAQUS fi nite element software. Then, through multiple nonlinear fi nite element analyses, it has been demonstrated that this type of connection can meet all the requirements of special moment resisting frames with rigid connections. The minimum thickness for the strengthened U-shaped profi le has been determined in such a way so that the plastic hinge could be created in the beam and the connection would have suffi cient stiff ness to be categorized as fully restrained. The eff ects of the geometry of the stiff ened channel link and the column-to-beam section modulus ratio on the behavior of the connection were investigated and a relationship has been developed to calculate the thickness of the stiff ened channel profi le. Also, evaluating the eff ects of axial loading in the column showed that the thickness of the U-shaped profi le and the stiff eners have no bearing on the axial load applied to the column.
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Mehrzad Tahamouli Roudsari,Shohreh Sohaei,Morteza Torkaman,Seyed Ali Safaee,Salar Tahmasebi,Saleh Mohammadi,Mohammad Mehdi Ghiasvand 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
Connections play an important role in the response of steel moment resisting frames to seismic loading. Prequalified rigid connections are applicable to I-shaped or box columns. In I-shape beam to concrete-filled tube (CFT) column connections, continuity and doubler plates cannot be added to the column. Various details have been proposed to address this issue, many of which are not constructionally convenient to implement. The aim of this study is to present a simple and suitable detailing for I-shape beam to concrete-filled tube column connections. To that end, six full-scale experimental samples were built and subjected to cyclic quasi-static loading. In the samples, stiffened and un-stiffened channel links were used to connect the beam to the column. In each sample, the stiffeners were installed on a different position on the channel link. The results showed that compared to the connection in which the beam is directly connected to the column, using the stiffened channel link with stiffeners along the beam’s flange increases the strength and ductility of the connection by 12% and 72%, respectively. Considering their desirable performance and easy implementation, these connections can be considered as a suitable detailing for I-shape beam to CFT column connections in seismic regions.
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